Koralia problem, question

[guppie]

I have 4 Hydor Koralia Evolution Circulation 1400gal on a Hydor Koralia Smart Wave Pump Controller, every time that they either switch on or off they make a clicking sound, is there anything I can do to make it stop, or do I just have to live with it. Koralia must have changed the pump, because I read the thread about putting the air tube on the shaft, the one I have does not have a shaft that you can put something on. Does anyone have a fix, thanks.

[Ucyibd1]

Nothing I know of that can be done, my 1050's do he exact same thing.....I even contacted Hydor about the issue, I was told by them it is normal to hear the click.

[Mpfaff77]

Yup mine do the same. I even did the airline trick. I have the non evolution. It helps but still hear clicking from impeller hitting backside of pump.

Next big purchase tunze pumps.

[TimeConsumer]

The clicking is intentional. It is to prevent the pump from starting backwards.

My pump clicked so many times on the on/off wavemaker that it broke that part. It started backwards about half the time after that. I stopped using them with wavemakers after that happened 4 times.